charing 8.4V NiMH battery for backup power

Discussion in 'General Electronics Chat' started by bug13, Mar 30, 2015.

  1. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
    38
    Hi guys

    What is the safe and easy way to charge a 8.4V NiMH battery for backup power supply. My device is power by 12V adapter normally. The NiMH battery is only used when the 12V is lost.

    I don't expect to use the NiMH battery at all as we don't usually have power cut, but lets say we normally have power cut 1-2 each year.

    Can I just use C/20 and leave it charge the battery 24/7?

    The package says standard charge 16 hours at C/10.

    Here is what I think it will work:
    Capture.PNG

    Here is the battery I want to use:
    [​IMG]

    Thanks guys!!
     
  2. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Read battery university

    C/20 sounds too high for 24/7 forever floating.

    You might want two different charge rates, one for recharge, and another for maintenance.
     
    Last edited: Mar 30, 2015
    bug13 likes this.
  3. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
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    But it doesn't mention any recommended standby charge rate, does anyone have any other source?
     
  4. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    bug13 likes this.
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